Introduction:
3.5 billion years ago, life first appeared; Animals were born in 1 billion years, vertebrates landed in 500 million years, and insects flew into the sky. Ape man appeared 3 million years ago, Homo sapiens arrived 200,000 years ago, and art and language arose 50,000 years ago. It took only 200 years for humans to fly out of the earth and start a new chapter of evolution. As we look back at the Blue Planet, we can't help but wonder what the future holds. Life has passed through the sea, land and sky, and perhaps the next step is to bravely step out of the planet and adapt to the empty and unknown universe.
